Garage Door Cable Came Off
My garage door cable came off — is it safe to fix myself?
What is actually causing it
Most likely first, based on what our crews find on the call.
01Door hit an obstruction and went slack
When the door lands on something, the cable goes slack for an instant and can jump the drum groove. It is the most common way a cable comes off, and it is also why it usually happens in one specific spot. The answer to the question in the heading is no: the cable is still connected to a wound spring, and rewinding a drum without unloading that spring is how people lose fingers.
Do not attempt this yourself. It is under spring or cable load and it injures people every year — this one is a licensed-technician job.
02Broken spring dropped the tension
A spring failure releases the cable's tension instantly and both cables can unspool. Assume the spring is broken until a technician confirms otherwise, and keep everyone out from under the door.
Do not attempt this yourself. It is under spring or cable load and it injures people every year — this one is a licensed-technician job.
03Drum set screws slipped on the shaft
A drum that has walked along the shaft feeds cable at the wrong rate and eventually loses the groove. Resetting it requires the springs unwound first.
Do not attempt this yourself. It is under spring or cable load and it injures people every year — this one is a licensed-technician job.
04Frayed or corroded cable
A cable that has lost strands no longer sits in the groove properly. Corrosion at the bottom bracket, where water pools, is the usual starting point.
Do not attempt this yourself. It is under spring or cable load and it injures people every year — this one is a licensed-technician job.
05Door forced open or closed by hand while engaged
Pulling a door up manually while the trolley is still connected racks it, slackens one cable and lifts it off the drum.
Do not attempt this yourself. It is under spring or cable load and it injures people every year — this one is a licensed-technician job.
06Bottom bracket loose or bent
The bottom bracket is the anchor point for the cable and it carries the entire lifting load. Loosening one is the single most dangerous action on a garage door. Never touch it.
Do not attempt this yourself. It is under spring or cable load and it injures people every year — this one is a licensed-technician job.
Why this happens more in California
Cable corrosion follows California's marine layer. In the coastal band — the South Bay, the Orange County beach cities, Santa Cruz, the Monterey Peninsula, and the Humboldt and Del Norte coast — salt aerosol reaches the strand interior through the galvanizing and cables fail years earlier than their inland equivalents. Ocean-facing garages that also take sprinkler overspray at the bottom bracket are the worst case. Stainless or heavily galvanized cable and a yearly inspection are the practical answer, and they are cheap relative to a derailment.
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Frequently asked questions
My garage door cable came off — is it safe to fix myself?
Is this safe for me to fix myself?
How much will the repair cost?
Are you licensed?
Describe the noise. We will tell you what broke.
Most calls are diagnosed in under two minutes, with a price range before anyone drives out.
CA-GARAGEDOOR California — California contractor licence CSLB #1098234. Licensed, bonded and insured. 1-year parts & labor.